Huang, I.-Yu and Sun, Chian-Hao and Tasi, Han-Cheng and Chou, Che-Ya and Huang, Chih-Sheng (2009) Development of a wide-tuning range and high Q variable capacitor using metal-based surface micromachining process. Sensors and Actuators A: Physical, 149 (2). 193 - 200.
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Official URL: http://www.sciencedirect.com/science/article/B6THG...
This study aims to improve the tuning range and quality-factor (Q) of micro variable capacitors for wireless communication applications. A suspending 0.5 μm-thick gold thin-plate with two-gap structure in one-to-three ratio of spacing is designed for the maximization of tuning range. To enhance effectively the flexural rigidity of top metal-plate and improve further the tuning range of the varactor, a double-cross-type microstructure with two vertical fixed-fixed beam springs and four horizontal fixed-guided cantilever beams is introduced. Besides, a glass substrate (Corning 7740) was used to reduce substantially the power dissipation and improve the Q-factor of variable capacitor. The new glass-based double-cross-type micro variable capacitor has demonstrated many superior performances, including the wide-tuning range (2100%, at 1.0 MHz with 6.0 V), the moderate capacitance (0.56 pF, at 2.4 GHz and without DC bias), 6.5 V pull-in voltage, and the high Q-factor (40.6, at 2.4 GHz). These characteristics approximately match with the theoretical derivation or simulated results from Agilent-ADS, Ansoft-HFSS, and IntelliSuite software.
|Uncontrolled Keywords:||Micro variable capacitor; Metal-based micromachining; Tuning range; Quality-factor; Pull-in voltage; Electromechanical and S-parameter analysis|
|Subjects:||Analytical Science > Nanotechnology for sensing and actuating|
Engineering > Nanotechnology applications in ICT
|Deposited On:||09 Apr 2009 12:42|
|Last Modified:||09 Apr 2009 12:42|
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